A) The two ventricles together in humans.
B) The heart that contracts under stimulation from nervous system.
C) Left Atrium and left ventricle in higher vertebrates.
D) Entire heart in lower vertebrates.
Correct Answer: C
Solution :Higher vertebrates exhibit the double circulation of blood, namely, systemic and pulmonary circulation. Systemic circulation involves the distribution of oxygenated blood via the aorta from the heart to all parts of the body and the collection of deoxygenated blood from all parts of the body through the great veins into the heart. Pulmonary circulation denotes the route of impure blood taken from the heart to the lungs for purification and then back to the heart; the left auricle receives oxygenated blood and passes it to the left ventricle. The left ventricle pumps the pure blood to all parts of the body through aorta. Hence, these two chambers are involved in systemic circulation and are referred to as systemic heart.
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